using System;

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = Array.ConvertAll(line, int.Parse);
        getAns(n, a);
    }
    static void getAns (int n, int[] a)
    {
        var ans = "";
        var t = "987654321";
        Array.Reverse(a);
        for (int i = 0; i < 9; i++)
        {
            if (a[i] == 0) continue;
            ans += new string(t[i], a[i]);
        }
        Console.WriteLine(ans);
    }
}